Resolutions-1997-021

3. Where there is considerable deflection of the water main materials required for either horizontal or vertical changes in alignment, ductile iron materials shall be used. P.V.C. water main materials SHALL NOT be bent. E. Separation from Sewers 1. There shall be no physical connection between a public or private potable water supply system and a sewer appurtenance, which would permit the passage of any sewage or polluted water in the potable supply. 2. Under normal conditions, water mains parallel to sewers shall be placed at least 10 feet horizontally from any sanitary sewer, storm sewer or manhole. Where local conditions prevent this separation, the water main may be laid closer provided the bottom of the water main is at least 18 inches above the top of the sewer and the water main is placed in a separate trench or in the same trench on a bench of undisturbed earth at a minimum horizontal separation of 3 feet from the sewer. 3. Water mains crossing sewer services, storm sewers or sanitary sewers shall be laid to provide a separation of at least 18 inches between the bottom of the water main and the top of the sewer. Where local conditions prevent this vertical separation, the water main shall not be placed closer than 6 inches above a sewer of 18 inches below a sewer under any circumstances. Additionally, one full length of water pipe crossing the sewer shall be centered at the point of crossing so that the water pipe joints will be equal distance as far as possible from the sewer. The water and sewer pipes must be adequately supported and have pressure tight joints. A low permeability soil shall be used for backfill material within 10 feet of the point of crossing. 4. No water pipe shall pass through or come in contact with any part of a sewer manhole. A minimum horizontal separation of 3 feet shall be maintained. 5. Water main shall be separated from sewer force mains by a horizontal distance of at least 10 feet unless: a. The force main is constructed of water main materials meeting a minimum pressure rating of 150 psi, and the requirements of Sections 8.2 and 8.4 of these standards, and: b. The water main is laid at least four linear feet from the sewer force main. F. Location of Valves 1. Four-way connections will have 3 valves. On looped systems, valves will generally be on the main line. Four valves may be required in specific instances.